Lavatera arborea vs shrub

Lavatera arborea and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lavatera arborea	Yes	No	No	No
shrub	Yes	No	No	No

As nouns, shrub is a hypernym of Lavatera arborea; that is, shrub is a word with a broader meaning than Lavatera arborea:

Lavatera arborea: arborescent perennial shrub having palmately lobed furry leaves and showy red-purple flowers; southwestern United States
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Lavatera arborea include bush.

Lavatera arborea (noun)	shrub (noun)
arborescent perennial shrub having palmately lobed furry leaves and showy red-purple flowers; southwestern United States	a low woody perennial plant usually having several major stems